Stan Hart is the stage name of Stuart Zagnit, an American actor born on March 28, 1952, who has built a extensive career in voice acting for anime, as well as in television, film, and theatre. His voice acting work is closely associated with the New York-based dubbing industry, particularly during the late 1990s and early 2000s, where he contributed to English adaptations produced by companies like 4Kids Entertainment, DuArt Film and Video, and TAJ Productions.

One of his most recognized and long-running voice roles is that of Professor Oak in the internationally successful Pokémon anime franchise. Hart provided the English voice for the character from the series' debut through the first eight seasons, covering episodes from the original series up to Pokémon Advance. His portrayal of Professor Oak is featured prominently in the franchise, including the films Pokémon 4Ever, as well as Pokémon 2000 and Pokémon 3. He also voiced the character in related media such as the video games Pokémon Snap and Pokémon Puzzle League. In later Pokémon series, he voiced a different character, Cedric Juniper, in Pokémon: Black and White.

In addition to his prominent role in Pokémon, Hart voiced multiple characters in the anime adaptation of Grappler Baki. In the English version of the OVA series Grappler Baki: The Ultimate Fighter, he is credited as the voice of both Kosho Shinogi and Seicho Kato. His work in the anime comedy The Irresponsible Captain Tylor includes voicing Dr. Hidezaburo Kitaguchi across the television series and providing the voice for Admiral Yutta Do Lonawer in later episodes of the OVA.

Beyond these roles, his anime voice filmography includes parts in a range of other series dubbed during the same era. He voiced Zolf in the fantasy series Slayers and appeared in the 4Kids adaptation of Winx Club as the character Mike. He also provided voices for the Teenage Mutant Ninja Turtles 2003 series, Twin Angels, and additional voices for shows like Shaman King and Viva Piñata.

Alongside his voice acting career, Hart has had an extensive and active career in theatre. He has performed in numerous Broadway, off-Broadway, and national tour productions, including roles in Wicked, The Producers, Fiddler on the Roof, Seussical, and Newsies. His live-action television appearances include guest roles on long-running series such as Law & Order and its various spin-offs, 30 Rock, The Good Wife, and Elementary.